A Connecticut couple exchanged their vows 'til death do them part, 18 hours before cancer took the bride's life.

David Mosher married the love of his life, Heather, before Christmas at St. Francis Hospital in Hartford, Connecticut. The remarkable wedding was sad given the circumstances of Heather's mortality, but her spirit at the altar was full of joy as her last words uttered were her vows.

The two met in a swing dance class, and although he was smitten by a fellow dance student in the room, his timing was off. "There was one night she was wearing these killer red pants and I told the two guys sitting next to me I’m going to ask that girl out tonight," David told NBC Connecticut.

At the time, Heather was seeing someone else. David told her to reach out to him if anything changed. Sure enough, four months later, she was single and agreed to go on a date with David.

Over the course of a year and a half, the two were in love. Then the devastating news came on December 23, 2015 and their lives were forever changed.

Heather was diagnosed with triple negative breast cancer after doctors have dismissed the lump in her breast. The cancer had spread to her brain.

David went ahead with his plans of proposing to her despite the news, confident that the two would survive this together. The Daily News recounted David's proposal.

She didn't know I was going to propose that night, but I said to myself, she needs to know she's not going to go down this road alone. A pair of draft horses, a carriage, and I arranged it all for that night. We went out on the carriage ride and I proposed to her under a street light,

Eventually, Heather's health took a turn for the worse, and friends and family had to act fast to ensure the couple would get the wedding they deserved by pushing the December 30, date sooner.

On her way to the alter, Heather's friends planned to lay the wedding dress on her, for fear the stress of putting it on would exacerbate her condition, but the bride insisted and managed to wear the beautiful gown.

Bridesmaid Christina Karas recalled the moment her friend made it to the altar to exchange her vows.

That moment right there was like, ‘Death, I’m not afraid of you! I am so in love and I am going to celebrate that love right now.

We were losing her as we were all standing there, thinking, to hold onto this, because this was the last she had to give.

Heather was buried on the day she was supposed to get married. "I saw her sick. I saw her in a lot of pain and she didn’t give up until she married me," said David. "It is so humbling that someone could love me like that."